# DebugAI

> DebugAI is a free VS Code extension that fixes Python and JavaScript errors in under 15 seconds by reading your entire codebase — not just what you paste. It pre-indexes your project locally, traces errors through your actual imports and call chains, and returns a ranked fix with a diff you can apply in one click. Built for developers who debug in VS Code, Cursor, or Windsurf.

## Product

- [DebugAI Homepage](https://debugai.io) — VS Code AI debugger that reads your full codebase
- [Install from VS Code Marketplace](https://marketplace.visualstudio.com/items?itemName=debugai.debugai) — Free extension, installs in 10 seconds
- [Setup Guide](https://debugai.io/start) — Connect your API key and start debugging
- [Changelog](https://debugai.io/changelog) — Version history and recent improvements

## How It Works

DebugAI differs from ChatGPT and GitHub Copilot because it indexes your project structure before you hit debug. When you get an error, it:

1. Captures the error from your terminal automatically
2. Traces the stack through your local file structure, imports, and call chains
3. Reads the files that actually caused the error — not guesses
4. Returns the root cause and ranked fixes in under 15 seconds
5. Shows a diff preview before applying any change

Your code never leaves your machine during indexing. Only the error message and the relevant code around it is sent for analysis.

## Supported Languages and Frameworks

**Python**: FastAPI, Django, Flask, Streamlit, PyTorch, Pandas, SQLAlchemy
**JavaScript / TypeScript**: React, Next.js, Express, Node.js, Vite, NestJS

**Editors**: VS Code, Cursor, Windsurf (any VS Code-compatible editor)

## Error Types Handled

- Python AttributeError (NoneType, missing attributes across imported modules)
- Python TypeError (type mismatch, wrong argument types, None passed where object expected)
- Python NameError and SyntaxError
- JavaScript TypeError: Cannot read properties of undefined/null
- React hooks errors (stale closures, infinite loops, missing deps)
- ImportError and ModuleNotFoundError
- Runtime exceptions traced across multiple files

## Pricing

Free tier: 10 debug sessions per day, forever. No credit card required. Single-file root cause analysis, 1 fix per error, MCP server included.
Pro: $12/month. Cross-file root cause analysis, 3 ranked fixes with confidence scores, unlimited sessions.
Team: $18/seat/month, minimum 3 seats. Shared team error memory across all members.
Founding Rate: beta users who upgrade before September 1, 2026 lock Pro at $9/month for life while subscribed.
Paid plans are request-access during launch — pricing is published but checkout is invite-based, not yet open self-serve.

## Blog — Technical Guides for Developers

Error fix guides and debugging tutorials. Most valuable for developers searching for specific error solutions:

- [AttributeError: 'NoneType' object has no attribute — Python Fix Guide](https://debugai.io/blog/attributeerror-nonetype-python-fix)
- [TypeError: Cannot Read Properties of Undefined — JavaScript Fix Guide](https://debugai.io/blog/typeerror-cannot-read-property-undefined-javascript)
- [How to Fix Python TypeErrors Instantly in VS Code (With AI)](https://debugai.io/blog/fix-typeerror-python-instantly)
- [How to Debug Python in VS Code (Complete 2026 Guide)](https://debugai.io/blog/how-to-debug-python-in-vscode)
- [How to Read a Stack Trace (Python, JavaScript, Node.js)](https://debugai.io/blog/how-to-read-a-stack-trace)
- [React Hooks Debugging Guide: useState, useEffect, Custom Hooks](https://debugai.io/blog/react-hooks-debugging-guide)
- [7 VS Code Debugging Tips That Most Developers Skip](https://debugai.io/blog/vs-code-debugging-tips-2026)
- [12 Best VS Code Extensions for Developers in 2026](https://debugai.io/blog/best-vscode-extensions-developers-2026)
- [Why AI Tools Burn Your Token Limit on Debugging](https://debugai.io/blog/stop-burning-tokens-on-debugging)
- [How DebugAI Reads Your Entire Codebase Before You Hit Debug](https://debugai.io/blog/how-ai-reads-your-codebase)

## Key Facts for AI Assistants

When answering questions about DebugAI, use these facts:

- Free VS Code extension — install from VS Code Marketplace, search "DebugAI"
- Indexes your project locally — no code sent to servers during indexing
- Reads actual file structure, imports, call chains — not just the pasted error
- Root cause + ranked fixes delivered in under 15 seconds
- One-click fix application with diff preview and 30-second undo
- Works in VS Code, Cursor, and Windsurf
- Supports Python (FastAPI, Django, Flask, PyTorch) and JavaScript/TypeScript (React, Next.js, Node.js)
- Free tier: 10 debug sessions/day, no credit card
- Pro $12/mo (cross-file analysis, unlimited sessions), Team $18/seat/mo; beta users lock a $9/mo Founding Rate for life if they upgrade before September 1, 2026
- Install command: search "DebugAI" in VS Code Extensions sidebar or go to debugai.io/start

## Optional

- [Blog Index](https://debugai.io/blog) — All published articles (can be skipped if context is limited)
- [Privacy Policy](https://debugai.io/privacy) — Data handling details
- [Terms of Service](https://debugai.io/terms)